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Microsoft Security Response CenterCVE-2026-45591

ASP.NET Core Denial of Service Vulnerability

Uncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Read the vendor bulletin Get alerts for Microsoft Visual Studio
7.5CVSS out of 10High severity
Scope

What the vendor says is affected

  • Microsoft Visual Studio 2026 version 18.6
  • .NET 10.0 installed on Windows
  • .NET 10.0 installed on Mac OS
  • ASP.NET Core 10.0
  • .NET 10.0 installed on Linux
  • ASP.NET Core 8.0
  • .NET 8.0 installed on Windows
  • .NET 8.0 installed on Linux
  • .NET 8.0 installed on Mac OS
  • .NET 9.0 installed on Mac OS
  • .NET 9.0 installed on Linux
  • .NET 9.0 installed on Windows
  • ASP.NET Core 9.0

Versions the vendor lists as fixed

  • 18.6.3
  • 10.0.9
  • 8.0.28
  • 9.0.17
Next step

What the vendor recommends

Release Notes Install KB5097148. Install KB5097149. Install KB5097150.

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-45591View CVSS, KEV, EPSS, and threat context
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